Carburetor heater



April 16, 1929. v U COON I 1,709,609

CARBURETOR HEATER Filed Jan. 13, 1928 BY ATTORNEY.

Patented Apr. Y 16, 1929.

"CARB'RETOR HEATER.

Application led January 13, 1828. Serial No. l.

My invention relates to a new and useful improvement in a carburetor heater adapted for use on various types of carburetors, and has for its object the provision of a heating attachment whereby the fuel passed intothe carburetorvmay be heated and vaporiaed to assist easy and quick starting of the engine, particularly in cold weather.

Another object of the invention is the provision of an attachment of this class which j will be simpley in structure, economical of manufacture and highly efficient in use.

Another object of the invention is the provisionin a device of this class kof a housing for enclosing the heating element and which may be easilyand quickly removed to permit re-L pairto and replacement of the heating element, .when necessary. Y

Another obj ect of the invention is the provision of an attachment of this class which will require a minimum amount of alteration on the carburetor for its installation.

Other objects will appeal' hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed. Y l

The invention will be best understood byv a reference to the accompanying drawings which form a part ofthis specification and in which,

Fig. 1 is a central, vertical, sectional view of the invention showing it attached to a cai'- buretor.

. Fig. 2 is a side, elevational view of a carburetor showing the invention attached.

Fig. 3 is a sectional view taken on line 3 3 of Fie. 1.

I have shown the invention attached to a carburetor having a bowl 7 secured to which and depending downwardly from which is a cylindrical housing 8 in which the metering pin and rack assembly is mounted. This cylindrical housing 8 is usually threaded on its lower end and provided with a cap which engages one end of the spring 9, the other end of which engages the lower end of the metering pin rack 10. In mounting the invention on the housing 8 the cap which -is threaded upon the lower end of the housing 8 is removed entirely.

The invention comprises an elongated cupshaped member l1 having a flange 12 at its open end and threaded interiorly for threading on to the lower 'end of the cylindrical housing 8. The flange is cut away as'at13 at its inner side to provide. an abutment shoulder for the spider disc la which serves to engage the lower end of the spring 9, the housing 11 thus communicating with the housing 8 so that the fuel delivered to the carburetor will 'flow into and till the housing 11. rlhe liange 12 is cut away at its nndersurface to provide the reduced portion 15 which peripherally threaded. A cup-shaped housing 16 is threaeed on the reduced portion 15 as shown in'Fig. 1. Extended around the cupshaped housing 11 is a layer 1T of mica or other suitable insulatin material. A heating element 18 is wrapped arounty tile covering 17 of mica and attached atk one end to a terminal 19 which projects through the layer 2l) of mica or other suitable insulating material which covers the inner surface of the housing 16. The terminal 19 also projects through the housing 16, a bushing 21 of insulating niaterial serving to insulate the terminal 19 from the housing 16. `The opposite end of the heating element 18 is attached to the screw 22 which is threaded into the housing 16.

Secured to the outer surface ofthe housing 16 is a block 23 of insulating material. u cured to this block 23 of insulating material is a thermostat comprising the layer 2 of one kind of metal and the layer 25 of another kind of metal, the co-eiiiciency of expansion of each of these metals being different so that upon a heating of the thermostat and an expansion thereof, the same will be caused to curl so as to move the contact member 27 carried by the layer 25 out of engagement with the end of the terminal 19. Connected to this thermostat is a wire 28 which connects to a suitable source of electrical energy which is grounded upon the car and consequently grounded to the housing 16. A housing` 29 is mounted upon the housing 16 and serves to enclose the thermostat so as to protect the same from dust and other foreign`material.

A suitablecontrol switch. not shown, serves to control the delivery of current through the wire 28 and the thermostat to the heating element 18 so that the heating element 18 may be used for heating the fuel in the cup-shaped member 11, when desired. Then the heating of the fuel has taken place sufficiently to cause an expansion of the thermostat, the circuit to the heating element 18 will be broken so that excessive overheating of the fuel in the member 11 will be prevented. It is believed obvious that the nature of the thermostat and its adjustment may be such that the desired temperature of the fuel in the housing' ll Will be obtained before the breaking ont' the circuit referred to.

ln order to repair or replace the heating element 18 it is obvious that the connection with the carburetor itself need not be disturbed, it being but necessary to remove the housing' 16 by unthreading the same 'therefrom.

Sheuld it be desired in the Warm Weather to remove tha` healing element entirely7 the same oit course may be done by removing the housing' lb'.

is believed that Vthe durability o'l the l ..e device is eridentn as Well its sim Dlicity f .v and the case with which it may be installei'l on a carburetor haring a threaded portion communicatingr with the interior of the carburefer and inroi an Which the luel may be pcrnfted Ato pass into the attachment.

YWhile l have `llustrated and described the pre't'erred 'li-erm o'i'f my invention, do not Wish to limit n'iysel te the precise details of structure shown7 but desire to avail myself of euch Variations and modifications as come VWithin the scol or' the aqjipended claims.

Haring' thus described my invention, What I claim as new and desire 'to secure by Let- Vters Patent is:

l. A carbrn'etor heater of the class described comprising: a cup-shaped nieml er threaded on a threaded` portion of a carburetor in communication therewith; a shoulder on the inner surface oli said cup-shaped member; a lspider mounted on said shoulder to pro Vide an abutment; ay heating element einbraci'ng said cup-shaped member; an enclosure for said heating4 element threadable on said cup-shaped member; and means for controlling,` an electrical circuit to said heating element.

2. In a device of the class described, a cup- .Cih'aped member havingl its open end interiorly threaded; a llange on the open end oit said cupshaped inember7 said 'flange being cnt away at its lower side and peripherally threaded; a layer oit insulating niaterial on the periphery ot said cup-shaped'membei a heating element wound round said ineulatine' material; an auxiliary cup-shaped member threaded on the perijlziherally threaded portion of said flange, the inner surface ot said auxiliary cup-shaped member beine` spaced from saidheating element; an insulating layer covering` the inner surface ot said auxiliary cup-shaped member, one end of said heating element being` attached to said auxiliary cup-shaped member; a terminal projected through and insulated from said auxiliary c1,11' sha} )ed member and attziched to the opposite end ot' said heating element; airinsulating. block mounted on Vthe periphery oli said auxiliary cup-shaped member; a thermostatieallyy movable metallic barmounted `on said insulating block; a contact on said bar adapted 'for engaging the outer endet said terminal; means for cennccting said harto a source of electrical energy; and a housing' for enclosing' said bar, said block and the outer end of said terminal.

in testimony whereof I have signed the 'liregoing` Specification.

VILAS U. COON. 

